The relative level of importance of a piece of content is given
by its number of ancestor strong elements; each strong element increases the importance of
its contents.

Changing the importance of a piece of text with the
strong element does not change the meaning
of the sentence.

Here is an example of a warning notice in a game, with the
various parts marked up according to how important they are:

<p><strong>Warning.</strong> This dungeon is dangerous.
<strong>Avoid the ducks.</strong> Take any gold you find.
<strong><strong>Do not take any of the diamonds</strong>,
they are explosive and <strong>will destroy anything within
ten meters.</strong></strong> You have been warned.</p>